Open Inventor Release 2024.2.0
 
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SoFaceSet Class Reference

Polygonal face shape node. More...

#include <Inventor/nodes/SoFaceSet.h>

+ Inheritance diagram for SoFaceSet:

Public Member Functions

virtual SoType getTypeId () const
 Returns the type identifier for this specific instance.
 
 SoFaceSet ()
 Creates a face set node with default settings.
 
- Public Member Functions inherited from SoVertexShape
SoNormalCache * getNormalCache () const
 Returns the current normal cache, or NULL if there is none.
 
SoTangentCache * getTangentCache () const
 Returns the current tangent cache, or NULL if there is none.
 
- Public Member Functions inherited from SoShape
virtual SbBool affectsState () const
 Overrides default method on SoNode.
 
ShapeType getShapeType ()
 Gets the current shape Full Scene Antialiasing type.
 
- Public Member Functions inherited from SoNode
virtual void setOverride (const SbBool state)
 Turns the override flag on or off.
 
virtual SbBool isOverride () const
 Returns the state of the override flag.
 
virtual SoNodecopy (SbBool copyConnections=FALSE) const
 Creates and returns an exact copy of the node.
 
virtual void touch ()
 Marks an instance as modified, simulating a change to it.
 
- Public Member Functions inherited from SoFieldContainer
void setToDefaults ()
 Sets all fields in this object to their default values.
 
SbBool hasDefaultValues () const
 Returns TRUE if all of the object's fields have their default values.
 
SbBool fieldsAreEqual (const SoFieldContainer *fc) const
 Returns TRUE if this object's fields are exactly equal to fc's fields.
 
void copyFieldValues (const SoFieldContainer *fc, SbBool copyConnections=FALSE)
 Copies the contents of fc's fields into this object's fields.
 
SoNONUNICODE SbBool set (const char *fieldDataString)
 Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.
 
SbBool set (const SbString &fieldDataString)
 Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.
 
void get (SbString &fieldDataString)
 Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string.
 
virtual int getFields (SoFieldList &list) const
 Appends references to all of this object's fields to resultList, and returns the number of fields appended.
 
virtual int getAllFields (SoFieldList &list) const
 Returns a list of fields, including the eventIn's and eventOut's.
 
virtual SoFieldgetField (const SbName &fieldName) const
 Returns a the field of this object whose name is fieldName.
 
virtual SoFieldgetEventIn (const SbName &fieldName) const
 Returns a the eventIn with the given name.
 
virtual SoFieldgetEventOut (const SbName &fieldName) const
 Returns the eventOut with the given name.
 
SbBool getFieldName (const SoField *field, SbName &fieldName) const
 Returns the name of the given field in the fieldName argument.
 
SbBool enableNotify (SbBool flag)
 Notification at this Field Container is enabled (if flag == TRUE) or disabled (if flag == FALSE).
 
SbBool isNotifyEnabled () const
 Notification is the process of telling interested objects that this object has changed.
 
virtual void setUserData (void *data)
 Sets application data.
 
void * getUserData (void) const
 Gets user application data.
 
- Public Member Functions inherited from SoBase
virtual SbName getName () const
 Returns the name of an instance.
 
virtual void setName (const SbName &name)
 Sets the name of an instance.
 
void setSynchronizable (const bool b)
 Sets this to be a ScaleViz synchronizable object.
 
bool isSynchronizable () const
 Gets the ScaleViz synchronizable state of this object.
 
- Public Member Functions inherited from SoRefCounter
void ref () const
 Adds a reference to an instance.
 
void unref () const
 Removes a reference from an instance.
 
void unrefNoDelete () const
 unrefNoDelete() should be called when it is desired to decrement the reference count, but not delete the instance if this brings the reference count to zero.
 
int getRefCount () const
 Returns current reference count.
 
void lock () const
 lock this instance.
 
void unlock () const
 unlock this instance.
 
- Public Member Functions inherited from SoTypedObject
SbBool isOfType (const SoType &type) const
 Returns TRUE if this object is of the type specified in type or is derived from that type.
 
template<typename TypedObjectClass >
SbBool isOfType () const
 Returns TRUE if this object is of the type of class TypedObjectClass or is derived from that class.
 

Static Public Member Functions

static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoNonIndexedShape
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoVertexShape
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
- Static Public Member Functions inherited from SoShape
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static SbBool isPrimitiveRestartAvailable (SoState *state=NULL)
 Returns TRUE if the primitive restart feature is available.
 
- Static Public Member Functions inherited from SoNode
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static SoNodegetByName (const SbName &name)
 A node's name can be set using SoBase::setName().
 
static int getByName (const SbName &name, SoNodeList &list)
 A node's name can be set using SoBase::setName().
 
- Static Public Member Functions inherited from SoFieldContainer
static SoType getClassTypeId ()
 Returns the type of this class.
 
- Static Public Member Functions inherited from SoBase
static SoType getClassTypeId ()
 Returns type identifier for this class.
 
- Static Public Member Functions inherited from SoTypedObject
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 

Public Attributes

SoMFInt32 numVertices
 Number of vertices per face or per contour.
 
- Public Attributes inherited from SoNonIndexedShape
SoSFInt32 startIndex
 Index of first coordinate of shape.
 
- Public Attributes inherited from SoVertexShape
SoSFNode vertexProperty
 vertex property node.
 
- Public Attributes inherited from SoShape
SoSFBool boundingBoxIgnoring
 Whether to ignore this node during bounding box traversal.
 

Additional Inherited Members

- Public Types inherited from SoShape
enum  ShapeType {
  POINTS ,
  LINES ,
  POLYGONS ,
  TEXT
}
 Basic type for antialiased rendering for this shape (Do not consider the SoDrawStyle property currently in the state). More...
 

Detailed Description

Polygonal face shape node.

This node represents a 3D shape formed by constructing faces (polygons) from vertices located at the coordinates specified in the vertexProperty field (from SoVertexShape), or the current inherited state. For optimal performance, the vertexProperty field is recommended.

Coordinates are used in order, starting with startIndex (zero by default).

If the first value in the numVertices field is -1 (the default), then all the coordinates (starting with startIndex) are rendered as a single face.

Otherwise each face uses the number of vertices specified by a value in the numVertices field. For example, an SoFaceSet with a numVertices of [3,4,4] would use the first three coordinates for the first face, the next four coordinates for the second face, and the next four coordinates for the third face. Thus the number of values in the numVertices field indicates the number of faces in the set.

SoFaceSet should only be used to render faces with 3 or more vertices. Otherwise the result is undefined. For example, do not set values in the numVertices field to 0, 1 or 2. To render lines or points, use SoLineSet or SoPointSet respectively.

SoFaceSet is a general purpose polygon rendering node. It can render triangles, quadrilaterals, and other types of polygons or any combination thereof. However:

  • For best performance, arrange the faces with all triangles first, then all quadrilaterals, then general polygons.
  • If the shape has only triangles, use SoTriangleSet instead (simpler and possibly faster).

SoFaceSet supports both convex and non-convex polygons (unlike OpenGL). However polygons are assumed to be convex by default. Rendering non-convex polygons in this mode may produce incorrect results. Enable non-convex polygons using the faceType field of an SoShapeHints node. In this mode SoFaceSet will automatically convert non-convex polygons, if necessary, to faces that the hardware can handle.

SoFaceSet can also directly handle complex polygons with "holes" (interior boundaries). See the following paragraphs.

If SoShapeHints is not used, or if the SoShapeHints::windingType field is equal to NO_WINDING_TYPE, SoFaceSet defines a set of faces. It uses the coordinates in order, starting with startIndex. Each face has a number of vertices specified by a value in the numVertices field. For example, an SoFaceSet with numVertices of [3,4,4] would use coordinates 1, 2, and 3 for the first face, coordinates 4, 5, 6, and 7 for the second face, and coordinates 8, 9, 10, and 11 for the third. The number of values in the numVertices field indicates the number of faces in the set. The default value (-1) means to use all the coordinates to define a single face.

If SoShapeHints is used with a SoShapeHints::windingType field is different from NO_WINDING_TYPE, SoFaceSet defines a complex (multi-contour) face. It uses the coordinates in order, starting with the first one. Each contour has a number of vertices specified by a value in the numVertices field. For example, an SoFaceSet with numVertices of [3,4,4] would use coordinates 1, 2, and 3 for the first contour, coordinates 4, 5, 6, and 7 for the second contour, and coordinates 8, 9, 10, and 11 for the third. The number of values in the numVertices field indicates the number of contours in the complex face.

The coordinates of the face set are transformed by the current cumulative transformation. The faces are drawn with the current light model and drawing style (SoDrawStyle). Diffuse color and opacity may be specified using the orderedRGBA field of SoVertexProperty. Diffuse color, transparency and other color parameters used in the lighting equation may be specified using SoMaterial.

Treatment of the current material and normal binding is as follows: The PER_PART and PER_FACE bindings specify a material or normal for each face. The _INDEXED bindings are equivalent to their non-indexed counterparts. The default material binding is OVERALL. The default normal binding is PER_VERTEX.

If any normals (or materials) are specified, Open Inventor assumes you provide the correct number of them, as indicated by the binding. You will see unexpected results if you specify fewer normals (or materials) than the shape requires.

Lighting is enabled by default (see SoLightModel). If lighting is enabled, by default only the "front face" of polygons are lit (the back face will be black). Which side is the front face is determined by the normal vector, if specified, else by the ordering of the vertices and the vertexOrdering field of SoShapeHints. You can also enable "two sided lighting" using SoShapeHints.

If lighting is enabled and no normals were specified, they will be computed automatically. The normal generator computes "facet" or "smooth" (or a combination) normal vectors depending on the creaseAngle field of SoShapeHints.

Textures may be applied using (for example) SoTexture2. Texture coordinates may be supplied using SoVertexProperty or SoTextureCoordinate2. If a texture is applied and no texture coordinates were specified, they will be computed automatically. By default the computed coordinates map the texture to the axis-aligned bounding box of the shape, with the texture S axis corresponding to the longest axis of the box.

Warning: A face set may not render or pick correctly if any of its polygons are self-intersecting or non-planar.

Limitations:

  • Due to limitations of the OpenGL VBO (vertex buffer object) rendering model, it is not possible to use VBO rendering (and performance may be lower) if either the normal binding or the material binding is set to either PER_PART(_INDEXED) or PER_FACE(_INDEXED).

FILE FORMAT/DEFAULT

    FaceSet {
    vertexProperty NULL
    startIndex 0
    numVertices -1
    }

ACTION BEHAVIOR

    SoGLRenderAction
    Draws faces based on the current coordinates, normals, materials, drawing style, and so on.

    SoRayPickAction
    Picks faces based on the current coordinates and transformation. Details about the intersection are returned in an SoFaceDetail.

    SoGetBoundingBoxAction
    Computes the bounding box that encloses all vertices of the face set with the current transformation applied to them. Sets the center to the average of the coordinates of all vertices.

    SoCallbackAction
    If any triangle callbacks are registered with the action, they will be invoked for each successive triangle generated from each face in the set.

SEE ALSO

SoCoordinate3, SoDrawStyle, SoFaceDetail, SoFullSceneAntialiasing, SoIndexedFaceSet, SoShapeHints, SoTriangleSet, SoVertexProperty

Definition at line 228 of file SoFaceSet.h.

Constructor & Destructor Documentation

◆ SoFaceSet()

SoFaceSet::SoFaceSet ( )

Creates a face set node with default settings.

Member Function Documentation

◆ getClassTypeId()

static SoType SoFaceSet::getClassTypeId ( )
static

Returns the type identifier for this class.


◆ getTypeId()

virtual SoType SoFaceSet::getTypeId ( ) const
virtual

Returns the type identifier for this specific instance.

Reimplemented from SoNonIndexedShape.

Reimplemented in SoVolumeFaceSet.

Member Data Documentation

◆ numVertices

SoMFInt32 SoFaceSet::numVertices

Number of vertices per face or per contour.

Definition at line 238 of file SoFaceSet.h.


The documentation for this class was generated from the following file: